Lock for sliding doors



(Mode1.)

J. H. D'OUGHERTY.

LOCK FOR SLIDING DOORS. No. 297,239. Patented Apr. 22, 1884.

N. PETERs Plluiq-L'rlhogrlphon Washinglon. D. C.

ilmrnn mares ATENI FFIQE...

JAMES HENRY DOUGHER'IY, OF WHISTLER, ALABAMA.

LOOK FOR SLIDING DOORS.

SPECIFICATION forming part of Letters Patent No. 297,239, dated April22, 1884.

Application filed April 30, 1883. (ModelJ To all whom, it may concern.-

Be it known that I, JAMES H. DOUGHERTY, of \Vl1istler,,.in the county ofMobile and State of Alabama, have invented certain new and usefulImprovements in Gar-Door Fasteners; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it pertains tomake and use it, reference being bad to the accompanying drawings, whichform part of this Specification.

My invention relates to an improvement in car-door fasteners; and itconsists in the combination ofthelocking-bolthaving its end madescrew-threaded,and provided with both a locking-arm and a projection forlocking the bolt in position, with a rocking frame and thesupporting-frame, through which the bolt is made to pass, and which isprovided with a central proj ection orflange forthe projection upon thebolt to catch behind, and thus hold the bolt in any desired position, aswill be more fully described hereinafter.

The object of my invention is to providea fastening for car-doors, bymeans of which the door can be both locked tightly in place or lockedjust sufficiently wide open to allow ventilation for the car.

" Figure 1 represents a side elevation of my invention, showing the doorlocked. Fig. 2 represents a simllar view, showing the door partiallyopen. Figs. 3, 4 are edge views of the two parts which form thefastener.

A represents a locking-frame, which is to be bolted or otherwise securedto the car at the edge of the door in the usual manner, and which isprovided with the slot B, through which the end of the bolt passes, andwith the opening 0 at its lower end, through which the lock is made topass. The locking-bolt will be made of any desired length, and perfectlyround its entire length, except at its end F, which is made in the shapeofa screw or worm, and at those two points where the locking-arm G andthe projection H are connected to it. The end F is made screwthat whenthis end has once been passed through the slot in the part A this endwill catch behind the part A and prevent the bolt from being withdrawnuntil the bolt has been partially turned around,so that its end willbebrought into a line with the slot through which it passes. In order toturn this bolt around so that its enlarged end can be withdrawn, it isof course necessary to raise the 1ocking-arm G upward, and then the boltcan be moved endwise. As long as the lock is passed through thelocking-arm and the hole 0 in the frame A, of course the bolt cannot bemoved, and hence the door cannot be opened. The projection H upon thebolt serves to catch between the two outer flanges, 0, formed upon thesupport P, and the central flange, N, placed midway between them. Thetwo outer flanges have holes through them, so that the bolt can passfreely back and forth between them, while the central flange is cut awayat its top, so as to allow the projection H on the boltto pass freelyover its top. When the cardoor is closed tightly, the projection catchesbetween the central and the outer flange; but when it is desired toallow the car-door to remain partially open, for the purpose ofventilation, the bolt is turned so that the projection H passes over thecentral flange and catches between this flange and the inner flange onthe support. As this projection is held between these two flanges sothat the bolt would be moved endwise, and as the bolt cannot be turnedin its bearings on account of the lock, which is passed through thelockingarm and the frame A, it will be readily seen that the door isheld rigidly in position, and cannot be opened unless the lock isremoved. As the outer end of the locking-bar is made screw or wormshaped,it is always in position, so that when the door is pushed shutthe end of the bolt strikes the slot in the frame A, and, passingthrough the slot, causes the bolt to turn partially around, and then,after the head has passed through the slot, allows the locking-arm todrop back into position. The locking-arm must be raised upward so as tothreaded or in the shape of a worm-gear, so I turn the bolt, in order tounlock the door, but

need not be touched when the door is being upon each of its edges, and acentral flange, in 10 closed, as the screw-threaded end of the boltbetween which flanges the projection H is causes it to operateautomatically. made to catch, substantially as described.

Having thus described my invention, I In testimony whereof Iaffix mysignature in 5 claim presence of two Witnesses.

The combination of the endwise-inoving J AMES HENRY DOUGHERTY.locking-bolt, provided with the locking-arm Vitnesses: G, and theprojection H, with the locking- T. TIE DEMAN,

frame A, and the support having a flange DENNIS RYAN.

